package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//检查用户是否已经完成登录
@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher(); // 路径匹配器：支持通配符写法
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}", requestURI);
        //定义不需要处理 的路径
        String [] urls = new String[] {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
        };

        // 判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        if (check) { // 不需要处理直接放行
            log.info("不需要处理：{}", requestURI);
            filterChain.doFilter(request, response); // 放行
            return;
        }

        // 说明需要被处理，判断登录状态，如果已登录，则直接放行（客户端）
        if (request.getSession().getAttribute("employee") != null) {

            log.info("用户已登录, 用户ID为: {}", request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            // 说明已登录;
            filterChain.doFilter(request, response); // 放行
            return;
        }

        // 说明需要被处理，判断登录状态，如果已登录，则直接放行(移动端)
        if (request.getSession().getAttribute("user") != null) {

            log.info("用户已登录, 用户ID为: {}", request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            // 说明已登录;
            filterChain.doFilter(request, response); // 放行
            return;
        }

        log.info("用户未登录");
        // 如果未登录则放回结果, 通过输出流向客户端页面响应数据即将数据写入web端
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    // 判断路径是否匹配
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI); // true为匹配成功
            if (match) {
                return true;
            }
        }

        return false;
    }
}


